2 Display Formats: support switching. The large screen of this alarm clock can clearly show the time (12-hour/24-hour mode switching), date (Year/Mon/Date), and the temperature (°C/ °F switchable). With temperature sensor, it can monitor the indoor temperature. Just like a companion to protect your health. Also you can get the important information at the same time
USB Charge & Battery Operated: there is a output port on the back (5V, 500mA) that allows charging with USB cables. Please make sure the USB power plug is connected to the clock. Batteries are for backup power use only and it requires 4pcs of AAA Alkaline batteries (not included).